Leonardo da Vinci's unfinished painting, "Saint Jerome in the Wilderness", is on show at the Chateau du Clos Luce in Ambroise, in France's Loire Valley, where the artist spent the last three years of his life. "Many questions remain unanswered, which is what makes this work so enigmatic", says the director of the château on the special loan from the Vatican Museums. IMAGES AND SOUNDBITES